To craft either Dark Red Fang Crystals with this, you need the Kagtunak knowledge that you can get from Seiri (General Goods Vendor in Duvencrune) after getting 1K Amity with her and doing a simple quest that crafts the Kagtunak.

The Quest: Assisting Seiri's Research

Just wave to get Amity up, unless you have Artisan 2+ Trading to get the knowledge on trade pieces in Drieghan.

i have the amity she won't cough up the knowledge. Guess I'll do all her missions maybe that's it.

Ok the amity is the issue, if you click on conversation there are three entries in the upper left corner I have the 1k amity for the kagtunak but i only have 999 for the two below it which I assume is why she won't give me the kagtunak knowledge. Trying to figure out why i only have 999 on the other two when I've done the dailies repeatedly. I haven't done the last quest in the main chain where you fight the dragon could that be it?

I befriended her but the quest doesn't appear to me. https://prnt.sc/9Aplsn_jUR7J

To recap the full set of requirements:
1) complete the Drieghan main questline
[Lv. 58 Drieghan I] A Crimson Shadow (31 quests)
[Lv. 58 Drieghan II] Spread of Terror (25 quests)
All the way up to and finishing the quest from Durgeff:
"[Drieghan] A Gift for a Hero"
https://bdocodex.com/cn/quest/7104/13/
2) find the 'Story of the Bloodwolves' book (which only appears at (in-game) *night time*:
https://bdocodex.com/cn/npc/35681/1/
3) finish the questline that item spawns, all the way through "Finally behold the Kagtunak"
https://bdocodex.com/cn/quest/7111/1/
4) raise your Amity with Seiri to 1000, and buy the Kagtunak knowledge
5) use an Alchemy Tool at your residence